Pivot block



FIG. 1, is a top perspective view of a pivot block illustrating a preferred form of my new design;

FIG. 2, is a top plan view thereof;

FIG. 3, is a bottom perspective view thereof;

FIG. 4 is a top perspective view of a pivot block incorporating another embodiment of my new design;

FIG. 5, is a top plan view of the embodiment of FIG. 4; and,

FIG. 6, is a bottom perspective view of the embodiment of FIG. 4. 

The ornamental design for a pivot block, as shown and described. 